对于单个样品，当最佳光程长获取存在较大误差时，应使所选光程长落在大于最佳光程长区域；
For a single sample, the pathlength should be selected in the range that is longer than optimum pathlength if a large pathlength selection error is unavoidable.
对于单个样品，当最佳光程长获取存在较大误差时，应使所选光程长落在大于最佳光程长区域；
For a single sample, the pathlength should be selected in the range that is longer than optimum pathlength if a large pathlength selection error is unavoidable.
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